From 07d0bf3763b7db4d8f93fbcd7a0be585ca47b10f Mon Sep 17 00:00:00 2001 From: hap Date: Wed, 28 Apr 2021 12:10:31 +0200 Subject: fmtowns: fill pcm ram with 0xff at power-on --- src/mame/drivers/fmtowns.cpp | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/src/mame/drivers/fmtowns.cpp b/src/mame/drivers/fmtowns.cpp index 85891a02bea..f86b7f7ea0c 100644 --- a/src/mame/drivers/fmtowns.cpp +++ b/src/mame/drivers/fmtowns.cpp @@ -2762,6 +2762,11 @@ void towns_state::machine_start() if (m_flop[1]->get_device()) m_flop[1]->get_device()->set_rpm(360); + // unitialized PCM RAM filled with 0xff (fmtmarty chasehq relies on that) + address_space &space = subdevice("pcm")->space(0); + for (int i = 0; i < 0x10000; i++) + space.write_byte(i, 0xff); + m_timer0 = 0; m_timer1 = 0; m_serial_irq_enable = 0; -- cgit v1.2.3